package com.interceptor;


import com.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements  HandlerInterceptor {


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("USER_SESSION");
        // 判断Session中是否有用户数据，如果有，则返回true,继续向下执行
        if(user != null){
            return true;
        }
        // 不符合条件的给出提示信息，并转发到登录页
        request.setAttribute("msg", "您还没有登录，请先登录！");
        request.getRequestDispatcher("/WEB-INF/views/login.jsp")
                .forward(request, response);
        return false;
        }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}